Polishing pad or device.



A. E. PFEIFFER.

POLISHING PAD'OR DEVICE.

, VAPPLICATION FILED JUNE 12, I916.

1,2l6,48& Patented Feb. 20,1917.

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tUNilTltU @ATEd lPAlEhlT Ff @Et ALLEN E. PEEIFFER, 0F NOR'WOOD, MASSACHUSETTS.

POLISHING PAD 0R, DEVICE.

Application filed June 12, 1916.

To all whom it may concern:

Be it known that I, ALLEN E. Prnrrrnn, a citizen of the United States, residing at Nor-wood, in the county of Norfolk and State of lilassachusetts, have invented new and useful Improvements in Polishing Pads or Devices, of which the following is a specification, reference being had to the accompanying drawings, forming part thereof;

This invention has reference to improve ments in polishing pads or devices.

As herein more specifically referred to. the invention relates particularly to pads, adapted to be used for polishing, which are made from sheets or strips of material; one of the purposes of the invention being to avoid waste of such sheet material so cuttin and manipulating the same that sub stantially all of said material can be uti-' lized.

Another object of the invention is to provide a pad manufactured from fibrous sheet material in which practically the entire periphery of the pad is constituted by continuous material and in which pad the relative arrangement of the fibers is changed from that of the sheet.

Another object of the invention is to improve the construction of pads made of felted material and particularly of polishing pads.

The invention consists in the improved pad as shall hereinafter be more fully described and pointed out inthe claims.

Figure 1. represents a plan view of a piece of material to illustrate certain conditions and steps in the method of manufacture.

Fig. 2, represents a plan view of one of the improved pads.

Fig. 3, represents a similar view showing a pad of modified construction.

Fig. 4, represents respectively enlarged plan. and edge views of fragments of a pad to illustrate one of the steps of manufacture.

Similar characters of reference designate corresponding parts throughout.

For the purpose of illustrating the present invention, and without thereby limiting the same, reference will be made to the invention as applied to a pad or pads made from a previously manufactured sheet of felt or felted material; said pad being adapted for use as a polishing device and particularly as a polishing pad or device for plate glass polishing machines in which Specification of Letters Patent.

Patented res. so, 1917.

Serial No. 103,082.

the pads may be of considerable size, sometimes approximately a foot or more in. diameter.

In the manner of manufacturing pads of this nature, previous to my invention, the fibrous material was manufactured in sheets orstrips of considerable thickness by the ordinary felting processes and from these sheets or strips of material were cut circular disks to constitute the pads, the waste material between the circular outlines of the adjacent disks or pads, constituting a considerable proportion of the previously manufactured sheet or strip, was then returned as waste and was necessarily reworked, passing again through all stages of manufacture before it could again be utilized for the making of pads.

In carrying the present invention into practice to avoid waste of material and to provide an. improved pad I take a sheet or strip of material of suitable dimension and divide the same on lines indicated by lines a, a Fig. 1 into strips Z) and cthe length of which is indeterminate but the width of which is preferably somewhat greater than one half the diameter of the proposed pad. I now take strip 6 and divide the same into two equal parts by the back and forth diag' onal cut (Z spaced from the edges of said strip 6 whereby I provide two continuous longitudinal margin members 6, 6 having projecting therefrom along one side the series oftapering members f, f having angularly extending edges. 1 next take one of said strips and form .or shape the same into the disk shown in Fig. 2 the end edges of the strip being brought together as at g, g and secure them in that position by means of a tape it attached by adhesive to the peripheral edge of said disk.

In some cases the rearrangement or readjustment of the fibers at the junctures of the tapering members 7, f when the strip is bent to form the disk shown in Fig. 2 results in the upsetting, buckling or thickening of the disk at these points of junctures somewhat as is shown in Fig. 4 at m and in such cases I apply pressure to such points to compress the upset material. In such bending of the strip from the straight to the curved direction to constitute the disk or pad shown in Fig. 2 the fibers of all of the tapering members 7", f are rearranged or changed as to their relative positions and said members 7, f which, in' the disk, extend radially toward a common axis, tend to effect an improved polishing action.

. these strips of modified form are bent to form disks said complemental engagements m, 0, of the respective members 70, k are interlocked as shown in Fig. 3, and the material X at the juncture of the members k, 7s is compressed.

In both of said constructions the margins of the disks arecontinuous except for a single line of juncture which is thought to be a desirable feature.

By the method of cutting the material and arranging it in disk form as above described all of the material is utilized and the resulting pad is better adapted for polishing purposes in view of the presence of the radial members f, f or 7c, 75 combined with the continuous margins embracing said members which margins, in the movement of the pad relative to the surface of the material under operation, act against all parts of said surface.

While I have herein referred to pads made of felt or felted material it is obvious that this invention is not limited to the use of such material.

Having thus described my invention I claim as new and desire to secure by Letters Patent. I

1. A pad of the nature described comprising a series of radial members united by a substantially continuous margin.

2. A pad of the nature described comprising a disk having a peripheral substantially continuous margin and members tapering inward from said margin and constituting the central portion of said disk.

3. A pad of the nature described comprising a disk wound from a strip of material having a continuous edge and an irregular edge, said continuous edge constituting the periphery of said pad.

4. A pad of the nature described comprising a disk constituted by a single coil of material and having a substantially continuous margin and a closed center.

5. A pad of the nature described comprising a disk having a center constituted by fitted members and a substantially continuous margin.

6. A pad of the nature described comprising a disk constituted by a wound strip of material of a width less than the diameter of said disk and of a length equal to the periphery of said disk, the line of juncture between the ends of said strip extending from the periphery of said disk approximately to its center.

ALLEN E. PFEIFFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. C. 

